eh? that's not quite right DoubleVision (sorry), what you've said is almost the direct oposite of the real reason for running one...
A thermostat blocks the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine (although there is coolant in the engine obviously). Once the engine reaches its operating temperature (generally about 160 - 200 degrees F), the thermostat opens. (Allowing coolant to flow and thereby cooling the engine)
By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions.
By not having a thermostat your engine takes longer to heat up, but once it has reached operating temperature, a car without a thermostat runs the same as one with.
I would always run a thermostat personally...
[ March 20, 2003: Message edited by: andybird ]</p>